Synthetic fuels and chemicals out of thin air.
From today’s emissions to tomorrow’s fuels — a new path to cost-competitive, fossil-free alternatives for the hardest sectors to decarbonize.
Our mission
Building a future where energy & commodities no longer rely on fossil fuels, but on CO2 from our atmosphere to industries. It's not just an alternative - we rewrite the baseline w/o compromise: not only clean, but cost-competitive, and scalable. Starting with methanol.
We are
Aerleum®
Aerleum® is a French company, co-founded in June 2023 by Steven and Sébastien, emerging from Marble, a climate venture studio.
The journey began with a simple idea: What if emitted CO2 was more than a problem, what if it was a resource?
As we explored this challenge, we reimagined the process from the ground up — eliminating costly steps, merging capture and conversion, and giving life to a new kind of integrated technology, built for scale.
Designed to compete with fossil fuels
Reactive Adsorbent
Our materials are dual-functional: they capture CO2 through adsorption and convert it directly into a target molecule — all on the same support.
Single Reactor
Designed for carbon capture and conversion in a single unit, our custom reactor is engineered for scale, versatility, and efficiency.
Precision Heating
A process heated in less than a minute? Yes, fast heat and instantaneous on/off switch. It's really suited for what we're doing.
Our sectors
From shipping to chemicals, we focus where decarbonization is the hardest — and impact, greatest.
Maritime
Aviation
Chemical industry
Road
All our partners
Join our fuel
Check-out our open positions if you're interested by the mission and willing to crack a climate challenge.
Co-founder & CEO
Sébastien
Co-founder & CTO
Steven
Some questions
What makes CO2-based methanol a viable alternative to fossil fuels?
Methanol is already widely used as a fuel, solvent, and chemical feedstock — with global infrastructure in place. By producing it from captured CO2 and green hydrogen, we enable a drop-in replacement that can significantly reduce lifecycle emissions while targeting cost parity with fossil-based methanol.
How is Aerleum’s technology different from traditional CO2 utilization processes?
Unlike conventional approaches that separate capture and conversion, Aerleum’s system uses a reactive sorbent that does both — it captures CO2 and converts it in situ. This integrated process eliminates costly intermediate steps, improves energy efficiency, and simplifies deployment.
Who is Aerleum built for — and where can your solution be deployed?
We focus on hard-to-abate sectors like maritime, heavy transport, and chemicals — where fossil dependence is still dominant and alternatives are scarce. Our modular system can be deployed at industrial point sources or integrated into clean infrastructure projects, anywhere on the map.
How do you source your energy and hydrogen?
Our system is designed for maximum siting flexibility. We co-locate directly where low-carbon hydrogen is produced under optimal conditions — whether that’s near renewables, electrolysis hubs, or industrial clusters.
By using hydrogen on-site, we significantly cut distribution and compression costs, which are major barriers to adoption. This also supports the development of hydrogen infrastructure where it makes the most economic and climate sense — close to cheap, clean energy sources.
Do you use CO2 from the air or from industrial sources?
Our technology is designed to flex between both, depending on the use case, economics, and climate impact goals.
For now, we’re focusing on atmospheric CO2, as it offers a clean, independent, and abundant carbon supply — especially valuable when co-locating with low-carbon hydrogen hubs.
That said, point-source CO2 remains highly relevant in contexts where it's concentrated and cost-effective.